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A very important feature of the Unified Budget Sampling is that sampling quality is independent of the number of area lights. Consider the following two renders. One is done using 3Delight the other is using PrMan. Parameters have been adjusted so that both renderers use the same number of light samples to render the image.

 

Renderer1 Area Light, 32 Light Samples7 Area Lights, 32 Light Samples
3DelightImage AddedImage Added

PrMan

Image AddedImage Added

 

Both renderers have the same sampling quality for the single area light case. For the 7 area light case, PrMan degrades substencially. The reason for the difference is as follow:

 

Info
  • 3Delight's ray budget is locally adaptive. This means that sampling quality does not depend on the number of lights.
  • PrMan's ray budget is per frame and simply divides light rays among light sources. This means that as soon as you increase the number of lights, you have to increase the sampling!